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  • 1
    Electronic Resource
    Electronic Resource
    Physiology and morphology of pheromone-specific sensilla on the antennae of male and female Spodoptera littoralis (Lepidoptera: Noctuidae)
    Amsterdam : Elsevier
    Journal of Insect Physiology 39 (1993), S. 253-260 
    Details
    ISSN: 0022-1910
    Keywords: Electrophysiology ; Lepidoptera ; Noctuidae ; Olfaction ; Scanning electron microscopy ; Sensilla ; Sex pheromone ; Spodoptera littoralis
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0022-1910(93)90096-A
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  • 2
    Electronic Resource
    Electronic Resource
    Larval diet influence on oviposition behaviour inSpodoptera littoralis (1995)
    Springer
    Entomologia experimentalis et applicata 74 (1995), S. 71-82 
    Details
    ISSN: 1570-7458
    Keywords: Lepidoptera ; Spodoptera littoralis ; oviposition ; deterrents ; feeding ; larval experience ; induction ; selection
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Females ofSpodoptera littoralis Boisd. (Lepidoptera: Noctuidae) with different feeding experiences during their larval development were tested for their ovipositional response to methanol extracts of larval frass and semisynthetic diets. The effect of the following frass, diet and diet component extracts was tested: (a) frass fromS. littoralis orAgrotis segetum larvae fed on a potato-based diet; (b) frass fromS. littoralis larvae fed on a wheat germ-based diet; (c) potato and wheat germ-based diets; and (d) potatoes and wheat germ. Ovipositing females without prior experience of the potato diet were deterred by extracts of: (1) larval frass from either species fed on potato diet; (2) the potato-based diet; (3) potato. Also females with experience of the potato diet during only a part of their larval development were deterred from oviposition by frass of larvae reared on the potato diet and by the diet itself. However, for females reared on the potato diet for their entire larval development, oviposition was no longer deterred by either of the three extracts listed above. Extracts of: (1) frass from larvae of either species reared on wheat germ diet: (2) the wheat germ diet; or (3) wheat germ did not significantly affect oviposition. Females with ablated antennae were still deterred by frass extracts from larvae fed on potato diet, when they had been reared on the wheat germ diet. In feeding experiments, larvae of larval stage one and of larval stage three-four reared on either of the two diets preferred to feed on the wheat germ diet. However, the preference was significantly stronger for larvae with no prior contact with the potato diet. The effect of larval experience on the loss of oviposition-deterring activity by extracts of larval frass, diets and diet components is discussed in view of induction and selection.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02383169
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Miniaturized light scattering detector for packed capillary supercritical fluid chromatography (1993)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Microcolumn Separations 5 (1993), S. 141-147 
    Details
    ISSN: 1040-7685
    Keywords: light scattering detection ; supercritical fluid chromatography ; packed microcolumns ; argentation chromatography ; triacylglycerols ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Packed capillary columns provide excellent separation of neutral lipids by supercritical fluid chromatography. For these separations, it is necessary to add a polar modifier to the mobile phase; hitherto, a detector suitable for quantitative analysis has been lacking. For this purpose, a miniaturized evaporative light scattering detector for combination with packed microcolumns in supercritical fluid chromatography has been developed. Since the detector response is dependent on the mobile phase flow rate, a drop in response was found at flow rates above 16 mL min-1 of expanded mobile phase. However, below this flow rate, there was a region of relatively constant response. In this region, quantitative analysis could also be successfully performed when the pressure and/or the temperature of the separation were programmed. The detection limit was lower than 6 ng. With pressure programming, the relative standard deviation in peak area was less then 4%. Minor peaks gave higher RSD values.Further, it is demonstrated that argentation SFC of triacylglycerols provides separation according to chain length as well as to the degree of unsaturation.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mcs.1220050209
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Study of diffusion coefficients in multi-component solutions using the daresbury synchrotron x-ray fluorescence microprobePresented at the European Conference on EDXRS, Myconos, Greece, 30 May-6 June 1992. (1993)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 22 (1993), S. 265-271 
    Details
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: In multi-component solution systems, the diffusion of one component can influence the diffusion of a second; in some instances, especially if the first component is an acid, the second component may diffuse against its own concentration gradient. The fundamental cause of this phenomenon is the local electrical field gradient established when particular ion species in mixtures of ionic components have different transport numbers. In ternary, quaternary and higher order systems, determination of the main and cross-term diffusion coefficients is difficult, and usually indirect.The Daresbury x-ray fluorescence (DXRF) microprobe was used to measure directly the concentrations of individual elements in an aqueous gel 1.45 mm from an interface with a solution of constant composition. The solutions contained known mixtures of cobalt, copper and zinc chlorides with and without hydrobromic acid. Similar measurements were made every 300 s over a period of 3 h. After this, measurements were made at 100 μm intervals from the interface of the gel to a depth of 6 mm to map the concentrations of Co, Cu and Zn.The diffusion coefficients were estimated by comparison of the concentration-time profiles for each metal with analytical or numerical simulations. The results show a significant coupling of the Cu, Co and Zn diffusive flows with the diffusive flow of the acid.This work has shown that the DXRF microprobe can be used to measure concentration-distance or concentration-time profiles of many elements simultaneously, thus enabling more direct measurements of multicomponent diffusion coefficients in solution to be made.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/xrs.1300220417
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    Paper (German National Licenses)
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